From 8700f65ae13ccdbeb6e66496ac2371c0a0fc0274 Mon Sep 17 00:00:00 2001
From: Arthur Hanson Rasmusson <arthur@vgpu.io>
Date: Sun, 25 Oct 2026 16:36:58 -0400
Subject: tools/vk: vk_frame gains an optional 7th arg (tiling: 0=optimal
 default, 1=linear) and a buffer-allocation type-retry loop; wall2: the
 QEMU-gdbstub kernel-breakpoint script (module VAs insert+patch but never fire
 - the stub's memory context does not resolve module VAs) and the kcore symbol
 dumper; session findings: the vkAllocateMemory -2 = the image's internal
 COMPR 2MB-page 64KB sub-allocation failing NV_ERR_NO_MEMORY after the image
 data alloc succeeds (both tilings)

---
 tools/guest-diag/wall2/kc_dump_fn.py | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 tools/guest-diag/wall2/kc_dump_fn.py

(limited to 'tools/guest-diag/wall2/kc_dump_fn.py')

diff --git a/tools/guest-diag/wall2/kc_dump_fn.py b/tools/guest-diag/wall2/kc_dump_fn.py
new file mode 100644
index 0000000..e481d24
--- /dev/null
+++ b/tools/guest-diag/wall2/kc_dump_fn.py
@@ -0,0 +1,21 @@
+import struct, sys
+VA = int(sys.argv[1], 16)
+N = int(sys.argv[2], 16) if len(sys.argv) > 2 else 0x800
+f = open("/proc/kcore","rb")
+hdr = f.read(64)
+e_phoff = struct.unpack_from("<Q", hdr, 0x20)[0]
+e_phentsize = struct.unpack_from("<H", hdr, 0x36)[0]
+e_phnum = struct.unpack_from("<H", hdr, 0x38)[0]
+segs = []
+for i in range(e_phnum):
+    f.seek(e_phoff + i*e_phentsize)
+    ph = f.read(e_phentsize)
+    p_type, p_flags, p_offset, p_vaddr, p_paddr, p_filesz, p_memsz = struct.unpack_from("<IIQQQQQ", ph, 0)
+    if p_type == 1:
+        segs.append((p_vaddr, p_memsz, p_offset))
+for v, sz, off in segs:
+    if v <= VA < v+sz:
+        f.seek(off + (VA - v))
+        d = f.read(min(N, v+sz-VA))
+        sys.stdout.write(d.hex())
+        break
-- 
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